The key line in the TIME interview is how Cook views Apple’s role in society.

Apple’s largest contribution to mankind will be in improving people’s health and well-being.

As for the video series, the first story covers a young named Michael Jackson, who very consciously cracks a joke about his namesake, suffering from spastic quadriplegic cerebral palsy.

One day, he received notifications on his Apple Watch about his heart rate being too elevated during a resting period. Michael rushed to the ER and was found to have sepsis.

The second, longer, four and half minute video uploaded by Apple is a more general Apple Watch advertisement, with multiple voiceovers of different users telling how their lives were saved by Apple Watch.

[Update: Cook later tweeted a similar line]

These new heart-monitoring innovations will change lives — another example of how humanity can shape technology for good. We believe that our work to help people better manage their health will be among Apple’s greatest contributions. pic.twitter.com/XY1zfnISLt